M58LR128KB datasheet(23/110 Pages) NUMONYX

23 / 110 page

M58LR128KT, M58LR128KB, M58LR256KT, M58LR256KB

Command interface

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4.8

Program command

The Program command programs a single word to the memory array.

If the block being programmed is protected, then the program operation aborts, the data in

the block does not change and the Status Register outputs the error.

Two bus write cycles are required to issue the Program command:

●

The first bus cycle sets up the Program command.

●

The second latches the address and data to be programmed and starts the

Program/Erase Controller.

Once the programming has started, read operations in the bank being programmed output

the Status Register content.

During a program operation, the bank containing the word being programmed only accepts

the Read Array, Read Status Register, Read Electronic Signature, Read CFI Query and the

Program/Erase Suspend commands; all other commands are ignored. A Read Array

command is required to return the bank to read array mode.

Refer to Section 8: Dual operations and multiple bank architecture for detailed information

about simultaneous operations allowed in banks not being programmed.

Typical program times are given in Table 18: Program/erase times and endurance cycles.

The program operation aborts if Reset, RP, goes to VIL. As data integrity cannot be

guaranteed when the program operation is aborted, the word must be reprogrammed.

See Appendix C, Figure 18: Program flowchart and pseudocode for the flowchart for using

the Program command.

4.9

Buffer Program command

The Buffer Program Command uses the device’s 32-word write buffer to speed up

programming. Up to 32 words can be loaded into the write buffer. The Buffer Program

command dramatically reduces in-system programming time compared to the standard non-

buffered Program command.

Four successive steps are required to issue the Buffer Program command:

The first bus write cycle sets up the Buffer Program command. The setup code can be

addressed to any location within the targeted block.

After the first bus write cycle, read operations in the bank output the contents of the Status

(SR7 = 1). If the buffer is not available (SR7 = 0), re-issue the Buffer Program command to

update the Status Register contents.

The second bus write cycle sets up the number of words to be programmed. Value n is

written to the same block address, where n+1 is the number of words to be

programmed.

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